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• W2465818493 abstract "Phenylephrine (PHE), a selective α1-adrenergic receptor agonist, is often used as a decongestant for mydriasis prior to cataract surgery, and its abuse might be cytotoxic to the cornea and result in blurred vision. However, the cytotoxicity of PHE to the cornea and its cellular and molecular mechanisms remain unknown. To provide references for secure medication and prospective therapeutic interventions of PHE, we investigated the cytotoxicity of PHE to corneal stroma and its possible mechanisms using an in vitro model of human corneal stromal (HCS) cells and an in vivo model of cat keratocytes. We found that PHE, above the concentration of 0.0781125% (1/128 of its clinical therapeutic dosage), had a dose- and time-dependent cytotoxicity to HCS cells by inducing morphological abnormality and viability decline, as well as S phase arrest. Moreover, PHE induced apoptosis of HCS cells by inducing plasma membrane permeability elevation, phosphatidylserine externalization, DNA fragmentation and apoptotic body formation. Furthermore, PHE could induce activations of caspase-3 and -9, disruption of mitochondrial transmembrane potential, downregulation of anti-apoptotic Bcl-xL, upregulation of pro-apoptotic Bax, along with upregulation of cytoplasmic cytochrome c and apoptosis-inducing factor. The cytotoxic and pro-apoptotic effects of PHE were also proven by the induced apoptotic-like ultrastructural alterations of keratocytes in vivo. Taken together, our results suggest that PHE has a significant cytotoxicity to corneal stroma cells both in vitro and in vivo by inducing cell apoptosis, and the pro-apoptotic effect of PHE is achieved via a Bcl-2 family proteins-mediated mitochondrion-dependent pathway." @default.
• W2465818493 created "2016-07-22" @default.
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• W2465818493 date "2016-08-01" @default.
• W2465818493 modified "2023-09-30" @default.
• W2465818493 title "The cytotoxic and pro-apoptotic effects of phenylephrine on corneal stromal cells via a mitochondrion-dependent pathway both in vitro and in vivo" @default.
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• W2465818493 doi "https://doi.org/10.1016/j.etp.2016.06.003" @default.
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